Abstract
Improving the utilization of non-renewable resources takes a crucial position in circular economy. Gob-side entry driving technology has been widely applied in coal mines in China, such as in the Shilawusu mine (Ordos City, Inner Mongolia), here considered as a case study due to its high safety and resource-recovery rate. However, at present the complexity of coal pillar utilization makes it hard to fully master the key technology for coal pillar size design, which leads to huge waste of coal resources. Based on theoretical calculation and numerical simulation, this study analyzed the basic mechanical structure of coal pillar and the characteristics of its weakening failure, providing theoretical reference for efficient recovery of coal resources. In general, results of this study can be helpful in pursuing the efficient, hence sustainable, development of mines with Gob-side entry driving technology.
Highlights
Gob-side entry driving with narrow coal pillars, due to the particular stress environment and high resource recovery rate, can guarantee the roadway safety and stability on the one hand and improve the recovery of coal resources on the other
The study of mechanical characteristics of coal pillar structure and its progressive weakening failure mechanism is highly important to the efficient recovery of coal resources and the sustainable development of coal mines
In the process of gob-side entry driving, the load of bolts and cables was monitored to supervise the stability of the coal pillar structure
Summary
Gob-side entry driving with narrow coal pillars, due to the particular stress environment and high resource recovery rate, can guarantee the roadway safety and stability on the one hand and improve the recovery of coal resources on the other. Renani [19] employed two dimensional and three-dimensional finite difference analytical methods in his study and established a strengthening model of weakening cohesion and intensified friction to simulate the progressive failure of hard rock pillar. On this basis, he deduced the stress–strain curve of hard rock progressive failure mechanism. He deduced the stress–strain curve of hard rock progressive failure mechanism He et al [20] used FLAC3D numerical simulation software to analyze the risk indicator distribution of coal pillars under different aspect ratios and complex pressure; besides, the tendentious characteristics of coal pillar failure were studied as well. A whole set of efficient utilization technology for coal pillar were formed
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